OF CONCHOLOGY. 267 



Scutellastra, H. and A. Ad., Gen. Rec. Moll, i, p. 466. 



Chenu, Man. de Conchjl. i, p. 377. 

 Cymhida, H. and A. Ad., Gen. Rec. Moll, i, p. 466, 1854. 



Chenu, Man. de Conchyl. i, p. 378. 

 Olana (?), H. and A. Ad., Gen. Rec. Moll, i, p. 466. (P. 



cochlear^ Gmel., type.) Chenu, Man. de Conchyl. i, p. 



378. Gray, Guide, p. 175. Cpr., Lect. Moll. p. 72. 

 Eruca, Tournefort, Gualteri, Index, 1742 (not Swains.) 



< Patellites sp., Walch., Naturg. d. Verst. ii, p. 168, 1768. 



Schrot., Naturfors. v, p. 102, 1775. Waller, Syst. Min. 

 ii, p. 468. Schrot., Lith. Lex. v, p. 112. Schloth., 

 Petrefactenkunde, p. 113, 1820 {= Patella^ fossil sp.) 



< Patellaria, Llhwyd, 1698. Schrot., Lith. Lex. v, p. 112. 



? GfonicUs, Rafinesque, Journ. de Phys. 1819, t. 88, p. 426. 

 Mke., Syn. Ed. ii, p. 90 (not G-oniclis, Raf., Sup. Mon. 

 Biv. Phila. 1831). 

 Lepas sp., Adanson, Voy. Sen. 1757. 

 Lepadites sip., D'Argenville, &c, (foss. sp.) 

 PateUus, Mont., Conch. Syst. ii, p, 66, 1810. 

 Lottia sp., Gray, fide D'Orbigny, Voy. Am. Mer. 

 ? PateUarius, Dum. 

 ? Cellana, H. Adams, P. Z. S. 1869, p. 274.* 



If we take as the type that which (according to the rule 

 adopted by Linn?eus) was the most common species known to 

 him, we shall undoubtedly select the Patella vulgata, of the 

 northern European seas. The type most commonly cited is that 

 of Lamarck, in 1801 (P. testudinaria), but his first type and 

 only species mentioned in 1799 was the P. granidaris. The 

 former, however, is probably an Acma'a. There are two verv 

 distinct types of dentition among the true PatelhB, and one 

 of them must be separated by name. As objections might be 

 raised to proposing a new generic name for Patella vulgata^f 

 from which I suspect Patella granulans may differ considerably, 

 I shall regard the former as the type of the genus, and the posi- 

 tion of the latter species will remain to be fixed whenever the 

 animal shall have been examined. 



Animal with a complete, uninterrupted branchial cordon be 

 tween the mantle and the foot ; destitute of side lappets on the 

 foot ; radula with the first two inner laterals on each side simi- 

 lar, in the same transverse line, parallel ; third lateral largest, 



* The diagnosis includes no characters of more than specific value. 

 The true place of the species can only be determined when the animal is 

 known. 



t I am indebted to Dr. Wm. Stimpson for the opportunity of examin- 

 ing the soft parts of this species. 



